AzureFileCopy - set automatically Content-Encoding

[hkusulja]

I am using latest cloud Azure DevOps - Release - Task Azure File Copy - version 4.*
to copy static files for web page to Azure Storage blob account container.
It also automatically sets correct content-type attribute in azure storage account.

However, attribute content-encoding is not set, and should be set for gzip,or brotli / .br files etc.

This is needed due to HTTP browser requirements, and CDN only pick-up data from Azure storage account with metadata.

Anyhow, like you support automatically setting the content-type, i suggest for azcopy.exe to support auto setting the content-encoding attribute.

[Delapouite]

gzip files can be inferred by checking their magic number as described here : https://stackoverflow.com/questions/6059302/how-to-check-if-a-file-is-gzip-compressed

Unfortunately it does not seem feasible for other compression scheme, such as brotli https://stackoverflow.com/questions/6059302/how-to-check-if-a-file-is-gzip-compressed - There's an issue opened about this topic : google/brotli#867